Means for supporting collector-rings.



, afm- W. P. DAWSQN. MEANS FOR SUPPORTING COLLECTOR RINGS. APPLIUATION FILED FBB.20, 1907.

WWNEESES WWW 5f Patented 061313,1908.

srnfrns Arana rimon- WILLIMF. DAWSON, OF RUGBY, ENGLAND, ASSIGNOR TO GENERAL ELECTRIC COMPANY,

1 t A CORPORATION OF NEW YORK. I

MEANS FOR SUPPORTING COLLECTOR-RINGS.

Ne. l900,710. l

. Specification of Letters Patent.

Patented Oct. 13, 1908.

Application med-February 20, 1907. Serial No. 358,458.

To all whom it concern:

Be itknown that I, WiLLLiM F. DAWSON, a citizen ofthe United States, residing at Rugby, ,En land, have invented certain new and' use ful mprovements in Means for SupportingCollector-Rings, of which the follow- 1n 1s a specification.

y invention relates to dynamo-electric machines and particularly to the support of the collector or slip rings in such machines. These rings must be supported upon the lshaft of the machine in such a manner as to be eHectively insulated from the shaft and at l the Sametime be rigidly united to the shaft so asnot to become loose during the operation of the machine. The'support of these lrings lin large sized machines, wherein the mechanical stress upon the supporting means is considerable and the difference of potential between the shaft andgthe rings is great has heretofore offered4 considerable difficulty.

'The object of my invention is to provide a simple and novel form of supportin f means for collector or sli rings, whereby t e rings may be rigidly he d -to the shaft and thoroughly insulated therefrom under any conditions of service'to which they may be sub- 1aed., f

To the above end, I secure to the inner periphery of each collector ring a plurality of cup-shaped members; the open' ends of the oups pointing toward the center of the ring. Thesecu s may readily be insu ated from the ring so t at any dif'ferenceof otential :nay

' be maintained between /thelcupsand the ring without dangerj` of ',fshort-circuiting; The

open ends of ther-ups are machined so' as to fit closely upon the shaft or other supporting member on which the collector rings are to be carried. The cups have a large .bearing surface u on the supporting member and therefore 't e danger of their working loose is minimized.

My" vention in its various aspects will be more fully understood from the lollowing detailed description taken in connection with l the accompanying drawing, wherein yFigure 1 1s, a side elevation of a collector ling supported u on a shaft in 'accordance with a preferred orm of my invent1on;-.F1g.

Y2.is a cross-section through a portion ol' the collector ring and one of the supporting devices taken on a plane at right an les to the axis ol' the supporting shaft; and` 1g. 3 is a through the supporting device.

Referring to the drawing, 1 indicates a collector ring and 1ya a shaft or other member upon which it is carried and from which it is insulated. In accordance with my invention the ring is supported from the shaft by means of a plurality of cups carried by the ring. 'l he number of these cups will depend upon the diameter of the supporting shaft, that is, as the diameter of the sup )orting member approaches that of the col ector ring, the number of cups which may be used, and preferably are used, increases. In the drawing I have shown the parts so proportioned that four of these cups 2, 2, 2, 2, serve to give a bearing surfacey extending substantially throughout the entire circumference of the shaft. The cups may be secured to the collector ring in any convenient manner. lliis is preferably accomplished by forming the ring with inwardly-projacting bosses 3 having iiattened faces 4; making the closed ends of the cups flat also, as at 5; placing a layer 'of insulation 6 in the shape of a Washer between each cup and lthe corresponding boss; and then securing the cups to the ring by means of insulated bolts or screws 7 The bolts or screws y7 may conveniently be insu lated from one of the parts, preferabl the cup, by means of insulating sleeves or ush ings 8 which extend through the closed end of the cups, through the insulating material 6 and, if desired, part way into the bosses on the collector ring. Washers of insulating -material 9 are placed in the cups across the ends of the sleeves or bushings. The .bolts or screws pass through the sleeves or bushings and into the bosses and their heads engage with the washers 9.,. The bolts or screws are tightened from the interior of the cups and draw ,the parts lirmly together.

"lhe openings 1() in the bosses into which the ends of the bolts or screws enter do not extend entirely through the collector ring,so that the outer or bearingsurface ofthe ring remains unbroken. f After the cu s have been assembled within thering and't 1e bolts or screws tightened, the whole is preferably dried in a vacuum and' the bolts or screws avain tightened..Y This processis repeated as laong as the drying op- 4eration leaves any slack to be taken up by the screws or bolts. The cups and insulating washers between them and the .collector Ting cross-section taken at right angles to Figf2,

are then treated with eo al er other suite-ble Varnish end the oups t iernselves are lilled with a moisture-resisting insulating eemoound such as sulfur. The inWardly-prj eeting ends of the oups are then bored out to lit the shaft or other supporting member upon which the ring is then oreed. To prevent rotation of the ring en the shaft dowel-pins orset-screws l1 may he passed through the edge of one or more of the cups and into the shaft.

lt will he seen that the collector ring end its inwardly-projecting members constitute an extremely str?l and secure structure wherein the ring member is reliablj,r insulated from the remaining parts in a cheap end simple manner; the broad bearing surfaces on the oups and the ring making it possible to insulate thoroughly without detraeting from the meclianieal strength ol the structure :is a whole. BY plecing'the insulation between the oups and the ring, the oups are enabled to engage directly with the shaft tlmnlghout a large area, end thus hold the ring' seeurely on the shalt.

W hat l claim as new and desire to secure by Letters ijatent. of the United States, is;-

ln a d5'naino-eleetrie machine, a shalt, eolleetor ring, and a connection between seid shaft and said ring comprising a eupsheped member insulated from said ring and engaging seid shaft its open end.

2. ln a dynemo-eleetric machine, a shalt, e, eolleeter ring, and e connection between seid shett and said ring` consisting of eu ps secured at their bases to and insulated troni said ring end engsging said shaft at their open ends.

3. ln a dynamo-electric machine, a shaft, a collector ring, and a plurality of cup-shaped n'ieinbers secured and insulated from said e shalt. A collector ring having extending radielly therefrom a plurality of eu -shaped members secured to and insulated 'rom said ring at their bases, and having their open ends shaped to lit a supporting member.

5. In combination, a collector ring member, a cup member, a layer of insulation between the ring member and the base of the cup member, a holding member passing through the base of the cup and into the ring, und insulation between said holding member and one of the other members.

6. ln combination, a collector ring, a cup, a layer of insulation between the ring and the base ol the cup, and insulated means for holding' the @up on the ring.

7. In combination, a collector ring, a cup, a layer of insulation between the ring and the (up, and an insulated serew .member passing through the base of the cup and into the ring.

tu. ln Combination., a collector' ring having an inwardly-projecting boss, a cup insulated at its base from said boss, and a screw eX- tendingr through the base ol the cup int-o the boss and insulated from the cup.

E). ln combination, a collect'or ring, o sup porting cup, :i layer of insulation between the ring and the base of the cup, an insulated my .hand this thirty-inst day of January, 190.7.

WILLIAM F. DAWSON. All7itnesses:

CHARLES H. FULLER., J. A. Fos'lnn. 

